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Top 10 Influential Events in carbon neutrality and climate change response for 2023

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Frontiers in Energy 2024年第1期18卷 1-3页

作者： Research Institute of Carbon Neutrality of shanghai jiao tong university Research Institute of Carbon Neutrality Shanghai Jiao Tong UniversityShanghai 200240China

In 2023, the global community intensified its efforts towards achieving carbon neutrality and addressing climate change, witnessing several impactful events. Research Institute of Carbon Neutrality, shanghai jiao tong university compiled the Top 10 Events (in chronological order) in the field of global carbon neutrality and climate change response for 2023, to share with readers these significant moments that document the ongoing ambition and collective efforts of human society.

关键词： neutral collective intensified

Martensitic Transformation in Fe-Mn-Si Based Shape Memory Alloys

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Journal of Materials Science & Technology 1999年第2期15卷 111-116页

作者： T. Y. Hsu (XU Zuyao)(shanghai jiao tong university, shanghai 200030, china) shanghai jiao tong university Shanghai 200030 China Chinese Academy of Sciences China

The critical driving force for martensitic transformation fcc ( gamma ) yields hcp ( epsilon ) in ternary Fe-Mn-Si alloys increases with the content of Mn and decreases with that of Si. Thermodynamical prediction of M//s in ternary Fe-Mn-Si alloys was established. The fcc ( gamma ) yields hcp ( epsilon ) martensitic transformation in Fe-Mn-Si is a semi-thermoelastic and the nucleation process does not strongly depend on soft mode. Nucleation occurs directly through an overlapping of stacking fault rather than pole mechanism, and it is suggested that stacking fault energy (SFE) is the main factor controlling nucleation. Based on the phenomenological theory of martensite crystallography, a shuffle on (0001)//h//c//p plane is required when d//1//1//1 does not equal d//0//0//0//2. The derived principal strain in Bain distortion is smaller, i, e., more reasonable than the values given by Christian. Alloying elements strengthening the austenite, lowering SFE of gamma phase and reducing T//N** gamma temperature may be beneficial to shape memory effect of Fe-Mn-Si based alloys. Accordingly, Fe-Mn-Si-RE and Fe-Mn-Si-Cr-N (or Fe-Mn-Si-Ni-Cr-N) are worthy to be recommended as shape memory materials with improved shape memory effect. (Edited author abstract) 48 Refs.

关键词： Mn Martensitic Transformation in Fe-Mn-Si Based Shape Memory Alloys Fe Si

Deriving new operator identities by alternately using normally,antinormally,and Weyl ordered integration technique

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Science china(Physics,Mechanics & Astronomy) 2010年第9期53卷 1626-1630页

作者： FAN HongYi1,YUAN HongChun1 & JIANG NianQuan2 1Department of Physics,shanghai jiao tong university,shanghai 200030,china 2college of Physics and Electric Information,Wenzhou university,Wenzhou 325035,china shanghai jiao tong university Department of Physics Shanghai China (GRID:grid.16821.3c) (ISNI:***) Wenzhou university College of Physics and Electric Information Wenzhou China (GRID:grid.412899.f) (ISNI:***)

Dirac's ket-bra formalism is the language of quantum *** have reviewed how to apply Newton-Leibniz integration rules to Dirac's ket-bra projectors in previous *** this work,by alternately using the technique of integration within normal,antinormal,and Weyl ordering of operators we not only derive some new operator ordering identities,but also deduce some new integration formulas regarding Laguerre and Hermite *** may open a new route of directly deriving some complicated mathematical integration formulas by virtue of the quantum mechanical operator ordering technique,without really performing the integrations in the ordinary way.

关键词： operator ordering identities Laguerre and Hermite polynomials the IWOP technique

Computer Simulation of the Structure and Propertiesof Nanocrystals

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Journal of Materials Science & Technology 1994年第6期10卷 418-424页

作者： Da CHEN(Dept. of Materials Science, shanghai jiao tong university, shanghai, 200030, china) shanghai jiao tong Univ Shanghai China

This paper provides a computer modeling method for the study of nanocrystals. Structural features,such as the boundary component proportion, the reduced density proportion, the excess lattice parameter, and the radial distribution function, have been atomistically simulated. The energy and elastic properties also have been investigated. Simulation results indicate that the structure of grain boundaries in nanocrystals is different from those of the amorphous and the gas, or rather, it is a special structure with some degree of short-range order. Moreover, the structure of crystallites is not entirely the same as that in the perfect crystal lattice. The present simulation method may become one of the foundations of the theoretical study of nanocrystals.

关键词： Simulation Computer Simulation of the Structure and Propertiesof Nanocrystals BDV

Dynamic behavior of the He Ⅱ-He Ⅰ phase transition under gravity

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Chinese Science Bulletin 2002年第2期47卷 162-164页

作者： ZHANG PengInstitute of Refrigeration and Cryogenics, shanghai jiao tong university, shanghai 200030, china Inst. of Refrigeration/Cryogenics Shanghai Jiao Tong University Shanghai 200030 China

The phase transition of superfluid helium (He II) to normal fluid helium (He I) is studied in this note. The He II -He I interface is found to move upwards under finite heat current. The temperature tracks are measured by four high resolution temperature sensors (HRTs). And the shifting of the λ　point temperature (phase transition temperature) along the cell is studied experimentally and theoretically. Under gravity, the shifting of the λ point temperature in-creases with the pressure. The experimental results agree well with the theoretical ones.

关键词： He II -He I interface gravity phase transition.

3-D NUMERICAL SIMULATION OF UNDERWATER EXPLOSION BUBBLE

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Chinese Journal of Aeronautics 1996年第1期9卷 38-42页

作者： Lu Chuanjing(shanghai jiao tong university, shanghai, china, 200030) shanghai jiao tong university Shanghai 200030 China

The problem is solved by use of the boundary integral equation method and the high order finite element discretization on the assumption that the flow of water is inviscid, incompressible and irrotational, and the bubble gas obeys the isoentropic rule. The evolution of bubble is simulated by means of mixed Euler-Lagrangian method. The comparison of the numerical results with the 'exact solution' of a spheric bub ble and experimental data shows that the mathematical model is reasonable and the 3-D numerical method has high accuracy. Important behaviour of bubble, such as immigration and jetting, and dynamic load on an ellipsoid near explosion are derived.

关键词： underwater explosions bubbles potential flow boundary integral method

In-situ Formed AIN Particulates and TiN Whiskers Mixture Reinforced Al Composite

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Journal of Materials Science & Technology 1996年第5期12卷 365-368页

作者： Chunxiang CUI Renjie WU and Guoding ZHANG (Institute of Composite Materials, shanghai jiao tong university, shanghai 200030, china) Institute of Composite Materials Shanghai Jiao Tong University Shanghai 200030 China

The TiNw-AINp/Al composite has been successfully fabricated by gas-liquid reaction method in an intensive electromagnetic mixing and casting in an appropriate cooling condition. The as-cast samples of the composite exhibit a homogeneous distribution of TiNw and AINp, and the in situ formed TiN whisker has a mean diameter of 0.5 μm and mean aspect ratio of 5.8~7.5, and the diameter of the AIN particulates is less than 5 μm. TEM observation indicates that there exist some submicron and nanometer sized in situ formed TiNw-AINp in α-Al matrix. The formation mechanism of in situ formed TiNw and AINp is also discussed

关键词： Al TiN AIN AlN

EFFECT OF REINFORCEMENT VOLUME FRACTION ON PRECIPITATION IN MATRIX OF SiC_p/AI COMPOSITE

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Acta Metallurgica Sinica(English Letters) 1993年第8期6卷 161-167页

作者： LIN Junshan LI Pengxing WU Renjie shanghai jiao tong university,shanghai,china postdoctoral,Institute of Composite Materials,shanghai jiaotong university,shanghai 200030,china shanghai jiaotong Univ Shanghai China

The differential scanning calorimetric(DSC) and transmission electron microanalysis (TEM) techniques were used to study the kinetic process of precipitation in matrix of cast SiC_p/2024 *** results showed that precipitation reactions of GP zone and intermediate phase S'(Al_2CuMg)in the composites were accelerated compared with SiC-free material,the peak temperatures of both reactions were *** reaction enthalpies of both the GP zone and intermediate phase S' formation in the matrix were substantially decreased after the addition of *** analysis found that the alloying element Mg segregated at the SiC/Al interfaces,and was depleted in the matrix near the *** precipitation-free zones(PFZ) and precipitation-sparse zones(PSZ) formed near the interfaces,as a results,the volume fraction of precipitates in matrix was reduced.

关键词： SiC_p/2024 composite differential scanning calorimetry precipitation in matrix

Theoretical Studies on the SAW Properties of LGS at High-Temperature in Optimal Cuts

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Journal of Materials Science & Technology 2004年第5期20卷 512-516页

作者： Xiaojun JI, Tao HAN, Wenkang SHI and Guowei ZHANGDepartment of Instrumentation Engineering, shanghai jiao tong university, shanghai 200030, china Dept. of Instrumentation Eng. Shanghai Jiaotong Univ. Shanghai 200030 China

Surface acoustic wave (SAW) devices play a significant role in signal processing, frequency control and sensing applications. In general, they cannot operate at elevated temperature. The new crystal of langasite provides possibility for surface acoustic wave devices applied at high temperature. This paper studies the SAW properties of single and doubly rotated cuts of LGS at high temperature. The calculated SAW properties of LGS are analyzed in space with aid of contour plots, and two promising SAW orientation regions at high temperature are presented. For some typical cuts and propagating directions within the two optimal regions, their SAW characteristics vs temperature are discussed. Based on the experimental evidence in some literatures, the reliability of calculated results is verified.

关键词： High-temperature Surface acoustic wave Langasite Optimal cuts